Access control cards are the encrypted cards that your employees and visitors will use to gain access to your building or certain areas where you need to restrict access. With all of our Proximity Access Control Cards you will need to pair up the right card with the reader you purchase. If you buy an Access Control Reader from our DX Series, then you will use DX Series Cards or Key FOBS. Same thing goes for our IDTECK Brand of readers, you will use IDTECK brand access cards or Key FOBS. Proximity Cards and Access Control Key FOBS are needed for Access Control Readers.